Patent US4376707A successfully refreshed from Google Patents.
US4376707A
Expired / Lapsed
US
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Process for the removal of urea from blood wash fluids and blood
Assignee: Gambro Dialysatoren GmbH and Co KG
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Filing: 1979-05-21
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Granted: 1983-03-15
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Expires: 1999-05-21
Abstract
Abstract A process is disclosed for removing urea from blood wash fluids or blood fluids in which the fluids are treated with an organic solid containing at least one proton-containing secondary substituent group which masks and activates the aldehyde group and the fluids and the solid organic compound are separated.
Inventors
- 👤 Hans-Dieter Lehmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:58
CPC Classifications
A; A61; A61M; A61M1/00; A61M1/14; A61M1/16; A61M1/1694; A61M1/1696; A61M1/36; A61M1/3687; B; B01; B01D; B01D15/00; A61M2202/00; A61M2202/04; A61M2202/0496; A61M2202/0498
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
61 words
A process for removing urea from blood wash fluid or blood fluid comprising the steps of treating said fluid with an organic solid containing at least one aldehyde group per molecule and at least one proton-containing secondary substituent group which masks and activates said aldehyde group to effect urea removal from said fluid, and separating said fluid from said organic solid.
Claim 2
Dependent Claim
61 words
A process for removing urea from blood wash fluid or blood fluid comprising the steps of treating said fluid with an organic solid containing at least one aldehyde group per molecule and at least one proton-containing secondary substituent group which masks and activates said aldehyde group to effect urea removal from said fluid, and separating said fluid from said organic solid.
Claim 3
Dependent Claim
31 words
A process according to claim 1, wherein said secondary substituent group is selected from the group consisting of --COOH, --CHO, --SO 3 H, --CONH 2 and --SO 2 NH 2 .
Claim 4
Dependent Claim
13 words
A process according to claim 1, wherein said secondary substituent group is --COOH.
Claim 5
Dependent Claim
40 words
A process according to claim 1 or 2, wherein in said compound said secondary substituent group is separated from said aldehyde group by a carbon-carbon bond or an even number of carbon atoms containing at least one conjugated double bond.
Claim 6
Dependent Claim
48 words
A process according to claim 4, wherein in said compound said aldehyde group and said secondary substituent group are attached to adjacent carbon atoms, which carbon atoms are bonded together by an olefinic double bond, or are attached to adjacent carbon atoms of an aromatic or heteroaromatic ring.
Claim 7
Dependent Claim
25 words
A process according to claim 1, wherein said compound is selected from the group consisting of phthalaldehydic acid, o-phthaldialdehyde, pyromellitic dialdehyde and hydroxylactone derivatives thereof.
Claim 8
Dependent Claim
14 words
The process according to claim 1, wherein said compound is fixed on a carrier.
Claim 9
Dependent Claim
12 words
A process according to claim 7, wherein said carrier is activated carbon.
Claim 10
Dependent Claim
22 words
A process according to claim 1, wherein said fluids are treated with an acid cation exchanger in addition to the organic solid.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-03-14 | 1986-09-13 | 1987-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-14 | 1990-09-13 | 1991-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-14 | 1994-09-13 | 1995-03-15 | $7700.00 | Window Closed / Lapsed |